... /universal couplingsize: 1/4", 3/8", 1/2", 3/4", 1"male adaptor, female adaptor, hose end without/with collarUS type and Euro typeMaterial ... :Carbon steelProduct DescriptionSpecification and size: Universal US hose end: Size: 1/4", 3/8", 1/2", 3 ... /8", 1/2", 3/4, 1"Universal EU female end: Size: 1/4", 3/8", 1/2", 3/4", 1" air hose coupling(European and U.S.Type)